#include <random>
#include <chrono>
std::mt19937 mtIns(std::chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l, int r) {return std::uniform_int_distribution<>(l,r)(mtIns);}
db rnd(db l, db r) {return std::uniform_real_distribution<db>(l,r)(mtIns);}
